Multiple Choice QuestionsAssertion : Mammary glands are apocrine glands.
Reason : The distal part containing secretory granules break down and leaves as a secretion.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Grey crescent is the area
at the point of entry of sperm into ovum
just opposite to the site of entry of sperm into ovum
at the animal pole
at the vegetal pole.
Assertion : Mammalian ova produces hyaluronidase.
Reason : The eggs of mammal are microlecithal and telolecithal.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Which of the following is true regarding sperm?
Fertilizin : for penetrating egg membrane
Hyalurodinase : for penetrating egg membrane
Acrosin : dissolves corona radiata
Capacitation : takes place in penis
B.
Hyalurodinase : for penetrating egg membrane
Hyaluronidase is a hydrolytic enzyme present in the acrosome of sperm (human testes). It lyses the glycosaminoglycans in the extracellular matrix holding the cell of the corona radiata together. As the coronal cells become more loosely associated, sperm cells can propel themselves inward, toward the zona pellucida by making a receptive cone or fertilization cone through the cytoplasm of the egg. Hyaluronidase may also be involved in breaking down the Zona Pellucida.
Fertilizin is a chemical substance secreted from the cortical region of egg cytoplasm to attract the sperm towards the egg.
Acrosin is released from the acrosome of a spermatozoa as a consequence of the acrosome reaction. It aids in the penetration of Zona Pellucida.
Capacitation is the final stage in the maturation process of spermatozoa. This takes place inside the genital tract as the sperm penetrates the ovum.
Assertion: In mammals the female secondary sexual characters are developed by gonadotropins.
Reason: Gonadotropins are secreted by graafian follicle.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
A cross section at the midpoint of the middle piece of a human sperm will show
centriole, mitochondria and 9 + 2 arrangement of microtubules
centriole and mitochondria
mitochondria and 9 + 2 arrangement of microtubules
9 + 2 arrangement of microtubules only
Which one of the following events is correctly matched with the time period in a normal menstrual cycle?
Release of egg: 5th day
Endometrium regenerates: 5 - 10 days
Endometrium secretes nutrients for implantation : 11 - 18 days
Rise in progesterone level : 1 - 15 days
Both corpus luteum and macula lutea are
found in human ovaries
a source of hormones
characterized by a yellow colour
contributory in maintaining pregnancy
The phase of menstrual cycle in humans that last for 7 - 8 days, is:
follicular phase
ovulatory phase
luteal phase
menstruation
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